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To my mind, if it's over $100, it's got to be a prism. Why? Because mirrors last around 4-8 years, but prisms last many decades.
Under $100, the AOE "High quality 2" mirror star diagonal" for $89 would be my choice. (I learnt that it's not worth being too stingy.) The finish on the focuser end looks like GSO Superview finish. Good!
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